Match regex works for one search, but scan does not

Question

The following gets me one match:

query = http://0.0.0.0:9393/review?first_name=aoeu&last_name=rar
find = /(?<=(\?|\&)).*?(?=(\&|\z))/.match(query)

When I examine 'find' I get:

first_name=aoeu

I want to match everything between a '?' and a '&', so I tried

find = query.scan(/(?<=(\?|\&)).*?(?=(\&|\z))/)

But yet when I examine 'find' I now get:

[["?", "&"], ["&", ""]]

What do I need to do to get:

[first_name=aoeu][last_name=rar]

or

["first_name=aoeu","last_name=rar"]

?

i tested your expression in `.net` flavor and it works fine. — John Woo, Sep 26 '12 at 07:04
@sawa Really? but it failed when I tested it on my `RegexBuddy 3.5.4`. — John Woo, Sep 26 '12 at 07:11

score 3 · Accepted Answer · edited May 23 '17 at 11:43

3

Use String#split.

query.split(/[&?]/).drop(1)

or

query[/(?<=\?).*/].split("&")

But if your real purpose is to extract the parameters from url, then question and its answer.

edited May 23 '17 at 11:43

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answered Sep 26 '12 at 07:00

sawa

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thank you! fwiw to anyone else tripped by this, query.split(/[&?]/).drop(1) results in the second scenario I asked for. – shicholas Sep 26 '12 at 07:06
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@shicholas I realized that, and changed my answer, but the original one with your modification may be better. – sawa Sep 26 '12 at 07:08

score 3 · Answer 2 · answered Sep 26 '12 at 07:14

Use other module provided by ruby or rails will make your code more maintainable and readable.

require 'uri'
uri = 'http://0.0.0.0:9393/review?first_name=aoeu&last_name=rar'

require 'rack'
require 'rack/utils'
Rack::Utils.parse_query(URI.parse(uri).query)
# => {"first_name"=>"aoeu", "last_name"=>"rar"}

# or CGI
require 'cgi'
CGI::parse(URI.parse(uri).query)
# => {"first_name"=>["aoeu"], "last_name"=>["rar"]}

score 0 · Answer 3 · edited May 23 '17 at 12:04

0

If you need extract query params from URI, please, check thread "How to extract URL parameters from a URL with Ruby or Rails?". It contains a lot of solutions without using regexps.

edited May 23 '17 at 12:04

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answered Sep 26 '12 at 07:12

Andrei Subbota

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Match regex works for one search, but scan does not

3 Answers3